generated from mwc/lab_scatter
102 lines
2.5 KiB
Python
102 lines
2.5 KiB
Python
# transform.py
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# ------------
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# By MWC Contributors
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# The functions in this module transform data.
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# None of them are finished; this is your job!
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def maximum(data):
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"Returns the largest number in data"
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highest = None
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for number in data:
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if highest is None:
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highest = number
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if number > highest:
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highest = number
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return highest
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def minimum(data):
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"Returns the smallest number in data"
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lowest = None
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for number in data:
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if lowest is None:
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lowest = number
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if number < lowest:
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lowest = number
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return lowest
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def bounds(data):
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"Returns a list of the smallest and largest numbers in data"
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lowest = None
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for number in data:
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if lowest is None:
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lowest = number
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if number < lowest:
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lowest = number
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highest = None
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for number in data:
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if highest is None:
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highest = number
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if number > highest:
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highest = number
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return [lowest, highest]
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def clamp(value, low, high):
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"""Clamps a value to a range from low to high.
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Returns value if it is between low and high.
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If value is lower than low, returns low. If value is higher than high, returns high.
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"""
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for number in value,low,high:
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if number < low:
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return low
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if number > high:
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return high
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else:
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return value
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def ratio(value, start, end):
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"""Returns a number from 0.0 to 1.0, representing how far along value is from start to end.
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The return value is clamped to [0, 1], so even if value is lower than start, the return
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value will not be lower than 0.0.
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"""
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num = value - start
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denom = end - start
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ratio = num/denom
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r = clamp(ratio, 0.0, 1.0)
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return r
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def scale(value, domain_min, domain_max, range_min, range_max):
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"Given a value within a domain, returns the scaled equivalent within range."
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r = ratio(value, domain_min, domain_max)
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d = range_max-range_min
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rd = r * d
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scaled = range_min +rd
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return scaled
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def get_x_values(points):
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"Returns the first value for each point in points."
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x = []
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for point in points:
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xs = point[0]
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x.append(xs)
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return x
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def get_y_values(points):
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"Returns the second value for each point in points."
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y = []
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for point in points:
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ys = point[1]
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y.append(ys)
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return y
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